Browsing by Author "PEARDON, MICHAEL JAMES"
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Glueball matrix elements on anisotropic lattices
PEARDON, MICHAEL JAMES (Elsevier, 1998)We describe a lattice calculation of the matrix elements relevant for glueball production in J/ radiative decays. The techniques for such a calculation on anisotropic lattices with an improved action are outlined. We ... 
Glueball spectrum and matrix elements on anisotropic lattices
PEARDON, MICHAEL JAMES (American Physical Society, 2006)The glueballtovacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the spatial lattice spacing ranging from ... 
Glueball spectrum from an anisotropic lattice study
PEARDON, MICHAEL JAMES (American Physical Society, 1999)The spectrum of glueballs below 4 GeV in the SU~3! puregauge theory is investigated using Monte Carlo simulations of gluons on several anisotropic lattices with spatial grid separations ranging from 0.1 to 0.4 fm. Systematic ... 
The glueball spectrum from novel improved actions
PEARDON, MICHAEL JAMES (Elsevier, 2000)Results for the interquark potential and lowlying SU(3) glueball spectrum from simulations using a new improved action are presented. The action, suitable for highly anisotropic lattices, contains a twoplaquette ... 
Heavy hadrons on an anisotropic lattice
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2004)Results from simulations of quarkonia and heavylight mesons on an anisotropic lattice are presented. The improved quark action and actionparameter tuning used in this study are discussed. 
High performance scientific computing using FPGAS with IEEE floating point and logarithmic arithmetic for lattice QCD
PEARDON, MICHAEL JAMES (IEEE, 2006)The recent development of large FPGAs along with the availability of a variety of floating point cores have made it possible to implement highperformance matrix and vector kernel operations on FPGAs. In this paper we seek ... 
Improved stochastic estimation of quark propagation with Laplacian Heaviside smearing in lattice QCD
PEARDON, MICHAEL JAMES (2011)A new method of stochastically estimating the lowlying effects of quark propagation is proposed which allows accurate determinations of temporal correlations of singlehadron and multihadron operators in lattice QCD. The ... 
Improving Algorithms to Compute All Elements of the Lattice Quark Propagator
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2005)We present a new exact algorithm for estimating all elements of the quark propagator. The advantage of the method is that the exact alltoall propagator is reproduced in a large but finite number of inversions. The ... 
In search of a scaling scalar glueball
PEARDON, MICHAEL JAMES (Elsevier, 1999)Anisotropic lattices are an efficient means of studying the glueballs of QCD, however problems arise with simulations of the lightest, scalar state. The mass is strongly dependent on the lattice spacing, even when ... 
Isoscalar meson spectroscopy from lattice QCD
THOMAS, CHRISTOPHER; PEARDON, MICHAEL JAMES (2011)We extract to high statistical precision an excited spectrum of singleparticle isoscalar mesons using lattice QCD, including states of high spin and, for the first time, light exotic J(PC) isoscalars. The use of a novel ... 
Matrix models, quantum gravity and the spectral dimension
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Proceedings of Science, 2005)Monte Carlo studies on nonperturbative 2D Euclidean Quantum Gravity can be done with the use of the Dynamical Triangulations method. The Monte Carlo moves defined within the dynamical triangulation method can be encompassed ... 
Measuring the aspect ratio renormalization of anisotropiclattice gluons
PEARDON, MICHAEL JAMES (American Physical Society, 2001)Using tadpoleimproved actions we investigate the consistency between different methods of measuring the aspect ratio renormalization of anisotropiclattice gluons for bare aspect ratios x054,6,10 and inverse lattice spacing ... 
Mesons at high temperature in Nf=2 QCD
PEARDON, MICHAEL JAMES; SKULLERUD, JONIVAR (American Physical Society, 2006)We report first results for spectral functions of charmonium in 2flavour QCD. The spectral functions are determined from vector and pseudoscalar correlators on a dynamical, anisotropic lattice. J/ and c are found ... 
Multihadron operators with alltoall quark propagators
PEARDON, MICHAEL JAMES (2008)Hadron spectroscopy on dynamical configurations are faced with the difficulties of dealing with the mixing of single particle states and multihadron states (for large spatial volumes and light dynamical quarksmasses). ... 
Multiple molecular dynamics timescales in Hybrid Monte Carlo fermion simulations
PEARDON, MICHAEL JAMES; SEXTON, JAMES CHRISTOPHER (Elsevier, 2003)A scheme for separating the high and lowfrequency molecular dynamics modes in Hybrid Monte Carlo (HMC) simulations of gauge theories with dynamical fermions is presented. The algorithm is tested in the Schwinger model ... 
Nonperturbative study of QCD on a 2 + 2 anisotropic lattice
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2004)We present preliminary results for the nonperturbative determination of the parameters in a 2+2 anisotropic action. The parameters are required to restore Lorentz invariance in longdistance correlators, using the ... 
Nonperturbative study of the action parameters for anisotropiclattice quarks
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (2006)A quark action designed for highly anisotropiclattice simulations is discussed. The massdependence of the parameters in the action is studied and the results are presented. Applications of this action in studies of ... 
A perturbative determination of the parameters of an anisotropic quark action
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE (Elsevier, 2005)The parameters of a 3+1 anisotropic quark action with Symanzikimproved glue are determined at 1loop in perturbation theory. 
Phase shift of isospin2 pi pi scattering from lattice QCD
THOMAS, CHRISTOPHER; PEARDON, MICHAEL JAMES (2011)Finitevolume lattice QCD calculations offer the possibility of extracting resonance parameters from the energydependent elastic phaseshift computed using the Luscher technique. In this letter, as a trial of the method, ... 
Practical alltoall propagators for lattice QCD
PEARDON, MICHAEL JAMES; RYAN, SINEAD MARIE; SKULLERUD, JONIVAR (Elsevier, 2005)A new method for computing all elements of the lattice quark propagator is proposed. The method combines the spectral decomposition of the propagator, computing the lowest eigenmodes exactly, with noisy estimators which ...